package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
//过滤器

@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //将reques和respons抓换成http类型的
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取本次请求的urI
        String requesURI = request.getRequestURI();//.../backend/index.html
        log.info("拦截到请求:{}", requesURI);
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        //判断本次请求是否需要处理
        //判断requesURI在不在urls范围内
        boolean check = check(urls, requesURI);
        //如果不需要处理,则直接放行
        if (check) {
            log.info("本次请求不需要处理", request,response);
            filterChain.doFilter(request, response);
            return;
        }
        //判断登录状态,如果以登录,就直接让他过去
//        if(request.getSession().getAttribute("employee") != null){
//            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
//            filterChain.doFilter(request,response);
//            return;
//        if (request.getSession().getAttribute("employee") != null) {
//            log.info("用户已登录,ID为:{}", request.getSession().
//                    getAttribute("employee"));
//            filterChain.doFilter(request, response);
//            return;
//        }
        //判断登录状态,如果已登录,则直接放行
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已登录,用户id为:{}",request.getSession().getAttribute("user"));
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }
        //判断登录状态,如果已登录,则直接放行
        Object employee = request.getSession().getAttribute("employee");
        if (employee != null) {
            log.info("用户已经登录,id为:", request.getSession().getAttribute("employee"));
            filterChain.doFilter(request, response);
            return;
        }
        log.info("用户未登录");
        //如果没有登录那么就放回未登录结果,通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    //路径匹配,检查本次请求是否需要放行
    public boolean check(String[] urls,String requestURI) {
        for(String url : urls) {           //路径和请求路径
            boolean match = PATH_MATCHER.match(url,requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
